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The vector hati+xhatj+3hatk is rotated t...

The vector `hati+xhatj+3hatk` is rotated through an angle `theta` and doubled in magnitude then it becomes `4hati+(4x-2)hatj+2hatk`. The values of `x` are

A

(a)`-(2)/(3)`

B

(b)`(1)/(3)`

C

(c)`(2)/(3)`

D

(d)`2`

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The correct Answer is:
A, D
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